If it wants something you dont have or can't get yet, run away and get out of render distance. It changes what it wants. Repeat until you can give it something you have. Only works when hosting, unfortunately doesn't work on servers
I say this with almost every dino, but trap it. It's so much easier. It's more work, but dude... if you're gonna invest the time into taming something you want? Fork out the resources, suck it up, and just build it a little 2x2 box with a ramp in and coax it in, then tame it in peace.